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belongs to a friend, said that it wouldnt start, hit it with starting fluid for a few weeks, and that worked, now that doesnt work

ive noticed the following-brand new coolant temp sensor
both fans on, all the time, running or not, cold or hot
iac valve doesnt look horrible, but.....
it has spark, getting fuel. compression is 125ish at all 4

i got it to start tonight- horrible shuddering idle, but all 4 firing, idle at 2k rpm, will restart fine after its warm. but cold start is a no go

belongs to a friend, said that it wouldnt start, hit it with starting fluid for a few weeks, and that worked, now that doesnt work

ive noticed the following-brand new coolant temp sensorboth fans on, all the time, running or not, cold or hotiac valve doesnt look horrible, but.....it has spark, getting fuel. compression is 125ish at all 4

i got it to start tonight- horrible shuddering idle, but all 4 firing, idle at 2k rpm, will restart fine after its warm. but cold start is a no go

maybe timing skipped a tooth?.....odd one

what thinks the land of soobies:D

i'd say your skipped tooth is a possibility - especially if it seems doggy when driven.

Hm yes at the least the both fans staying on all the time is suspicious. I know it will do that as a failsafe if the sensor is disconnected. But if that sensor is way out of spec and the ECU thinks the coolant temp is actually say 205F when it is really 30F it's probably not going to inject enough fuel for it to run, so maybe the starter fluid helps it out a bit. That might also explain why it will restart ok if the engine is warm.

reset and see what reappears. If they all reappear, then you may have a bad ECU, not sending out it's 5vdc reference signal. all those sensors besides the 02, run on 5v. Also, you could have a bad ground to or in the ecu.

Could be a bad o2 sensor. Might try cleaning the MAF sensor if it has it. PCV valves are known to cause strange issues as well so if that hasn't been replaced it should be.
Make sure all vacuum hoses are in good shape and the breather and PCV hoses are clear of obstruction and connected properly.

One other option is the timing belt. If it has jumped one tooth the car may still run fine cold but have issues when warm.

Maybe unplugging the front o2 sensor connector and then see if the same thing happens or not after it warms up. That way if it doesn't do it after it warms up with the front o2 unhooked that might be your issue.

Basically anything out of the ordinary. Are the O2 voltages within spec? (The front sensor, Bank 1 sensor 1, is the one that controls fuel/air mixture).
Fuel trims should be somewhere around 10% to -10%. (The reading will be positive or negative depending on if the ecu is adjusting towards rich or lean A/F ratio. Beyond 10% can mean the sensor is bad.
Are any other sensor readings out of spec? Coolant temp, MAP/baro pressure/vacuum, MAF flow rate, that sort of thing.